1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
// ICE Failed to normalize closure with TAIT
// issue: rust-lang/rust#109020
//@ check-pass
#![feature(type_alias_impl_trait)]
use std::marker::PhantomData;
type WithEmplacableForFn<'a> = impl EmplacableFn + 'a;
#[define_opaque(WithEmplacableForFn)]
fn _constrain(_: &mut ()) -> WithEmplacableForFn<'_> {
()
}
fn with_emplacable_for<'a, F, R>(mut f: F) -> R
where
F: for<'b> FnMut(Emplacable<WithEmplacableForFn<'b>>) -> R,
{
fn with_emplacable_for_inner<'a, R>(
_: &'a (),
_: &mut dyn FnMut(Emplacable<WithEmplacableForFn<'a>>) -> R,
) -> R {
loop {}
}
with_emplacable_for_inner(&(), &mut f)
}
trait EmplacableFn {}
impl EmplacableFn for () {}
struct Emplacable<F>
where
F: EmplacableFn,
{
phantom: PhantomData<F>,
}
fn main() {
with_emplacable_for(|_| {});
}
|
